Justin parmelee



(No Model.)

. J. PARMEEEE.

APPLIANCE FOR THE ART OF MOLDING. No. 374,000. \Patented Nov. 29, 1887.

A T T 1 uWml oz W yaw 0 UNITED STATES P TENT OFFICE.

JUSTIN PARMELEE, OF CHICAGO, ILLINOIS.

APPLIANCE FOR THE ART OF MOLDING.

SPECIFICATION forming part of Letters Patent No. 374,000, dated november'ze, 1887.

Application filed December 13, 1586. Serial No. 221,438. (No model.)

To (LZZ whom it may concern.-

1 for practicing or to the apparatus usedin practicinga novel mode or method of making sand molds for casting hollow articles, (such as pipe-connections, &c.,) which novel mode or method of casting is made the subject of another application for Letters Patent by me, No. 221,437, filed simultaneously with this case; and my said present invention consists in an apparatus or contrivance comprising follow boards and half flasks of the peculiar construction and adapted to work together in the particular manner that will be hereinafter morefully explained, and which will be distinctly pointed out and clearly defined in the claims of this specification.

To enable those skilled in the art to which my invention relates to make and use a contrivance embracing mypresent improvements I will now proceed to more fully describe the latter, referring by letters to the accompanying drawings-,which form a part of this specification, and in which I have shownmy improvement carried out in that form inwhich I have so far successfully practiced it, and which is about the best form now known to me.

In the drawings, Figure 1 is a perspective View of one of two follow-boards, of novel construction, that compose parts of my improved coutrivance. Fig.' l is a view showing a. half-pattern applied to one ofthe followboards. Fig. 2 is a perspective view of one of a pair of metallic half-flasks constituting parts of my improved apparatus. Fig. 3 is a view showing the arrangement together of one ofthe follow-boards,one ofthe half-flasks, and an ordinary rolling board or bottom board that compose parts of my novel apparatus.

Fig. 4 is a. view showing the arrangement together of one of the halfflasks, one of the half- .patterns, and an ordinary core-arbor, (for supporting the sand core,) with the flask filled to form a half-mold.

In the several figures the same parts will be found designated by the same letters of reference.

My improved apparatus comprises two fol low-boards, A, in connection with which are made of metal) of the articleto be cast-such, for instance, as seen at B, which is a half-shell or half-pattern of a pipe elbow or coupling,

two metallic halfflasks, C, and an ordinary rolling-board or bottom board, I, in addition to which may be usedin molding such sand cores as require some internally-arranged supporting device-a core-arbor, such as seen at E.

The main peculiarity of or the novel structural feature in the follow-boards A is the construction of each with a simple plane pattern supporting surface adapted to support the pattern (such, for instance, as seen at B) with its convex exterior uppermost, for the purpose of forming thereon one half of the employed the hollow half-patterus (preferably sand mold proper. Each of said follow-boards has projecting devices m, which engage with the edges of one of the metallic half-patterns in place laterally on the board when placed thereon, and also pins 0,(or their equivalents,) for regulating the relative position of each of the haltflasks O on its follow-board, while the said half-flasks have 'register-pins,by which the proper relationship of the flasks to each other is assured, in a manner well known.

The half-flasks O, which are preferably made ofmetal, being duplicates in construction, a description of one will answer for both. The half-flask C is formed or provided, as clearly shown, with a semi-cylindrical core-supporting device, 0, at each end, projecting inwardly from thewall of the flask, and of a size and .shape such that its semi-cylindrical end cor- .responds exactly with the semicircular end of the half-pattern B, and the size of the flask and the position and extent of projection inwardly of each of said devices a are such that when the halfpattern B shall have been molded in the half-flask, as seen at Fig. 4, the

quite meet or touch the ends of the pattern, though coinciding or being in line therewith. It is important that this relationship of the inner ends of the pattern to the adjacent devices B, for the purpose of holding said pattern B ends of the curved rim-like devices 0 will not ICO o be observed, so that, as seen at Fig. 4, there shall be a thin stratum of sand leftbetween the adjacent ends of the pattern and said devices 0, in order that after the removal of the metallic pattern B the perimeter or wall of the mold thereot'shall be composed wholly ofsand, to thus prevent the possibility of the hot metal (to be poured into said mold) coming into contact with the inner ends of the metallic devices 0. Of course, if the pattern be of a different shape from that shown, the contour of the projecting devices 0 must be correspondingly different, the function and cft'cctof these devices 0 being to project inwardly and near to the pattern end and conform in shape therewith, so as to form continuations, as it were, of the interior concave and exterior convex surfaces of the pattern, to support the sand used, both while forming the sand mold and the sand core, all as will be presently further explained.

In the use of a contrivance or apparatus such as shown (for the purpose of practicing the improvement in the art of molding that is made the subject of my said other application) the parts or devices hereinbefore referred to, and shown in thedrawings, are worked or manipulated about as Iwill now explain. I take one of the follow-boards A, (see Fig. 1,) and having adjusted thereon one of the half-patterns B, with the convex surface of the latter uppermost, as shown at Fig. 1, I next place in proper position on the follow-board, and surrounding said half-pattern, one of the metallic half'flasks O, the inwardly-projecting devices 0 of said flask coming in line with the ends of the metallic pattern and nearly meeting the same, as seen at Fig. 4, where the parts have been turned over after the formation of the mold. I then fill in this flask with sand, which of course rests upon the metallic pattern B and on the devices 0, which latter practically constitute continuations ofthe ends of said pattern, and having rammed the sand down well, in the usual manner, I then strike off the sand, and, after having sprinkled it over, apply on top of the sand and half-flask a plain rolling-boardsuch as seen at I-so that the apparatus presents the appearance seen at Fig. 3. The parts thus arranged are then all turned over or upside down and the followboard A removed, leaving the half-pattern B embedded in the sand within the half-flask, the top edges of said pattern being of course perfectly fl-ush or on a level with the top edges of the flask, as seen at Fig. 4. I now fill in the interior of the pattern B, and also the interiors of the inwardly-projecting rim-like devices 0 of the fiask,with sand, for the purpose of forming one half of the core, in doing which it will be seen the sand (to form thecore) is firmly supported at the projecting end portions of the core by means of the devices a. The pattern itself, however, will have been previously rapped, so as to subsequently get a better lift, which operation is not possible, as is well known, with the old mode of molding and with the old appliances, because of the core being in the pattern from the beginning of the molding operations. The operations just described are now repeated with the duplicate follow-board, flask. and roll-over board, and with the other half of the metallic pattern, except that a corearbor, E, (such as usually employed,) is inserted within the other halfpattern and the concave portions of the devices c in forming the last half of the sand core, for purposes well understood, and in lifting the flask containing this last half of the mold and the last-made halfof the core (in or der to place it on top of the other flask) the ends of the said core arbor may be conven iently held by the fingers of the attendant, thus not onlypreventing any possible drop of the core, but also insuring the properholding up of the metallic pattern in place while handling'the flask. The two flasks having now been properly put together,the last-mentioned flask is lifted off and laid one side, thus exposing the upper half of the two half-patterns,which upper half-pattern is then rapped and lifted off, exposing one half of the finished core and the sandsnrface of the lower half-flask. After.this the half-flask that was removed is put back into its former relationship with the other flask and its centents,and after the application on top of arolling-board the combined parts or appliances are all turned upside down, when, with a sprue-cutter or hollow tube,a hole is made down to the metal gate (fastened on the remaining half of the pattern) and the other half-flask (which is now on top) is lifted off, and the other halfpattern, after having been properly rapped, is removed. The edges of the walls of the mold are then wetted and the we'll-hole is blown out, after which the two parts of the flask are reunited ready for the pouring operation.

In putting the parts of the flask together they are secured in the proper relative position, as usual, by means of the common clamping devices applied to the lugs e, after which the guide-pins or steady-pins are knocked out, to be reused with another duplicate set of devices for molding another pattern.

What I claim as new, and desire to secure by Letters Patent, is

1. A half-flask formed or provided with inwardly-projecting sand-supporting devices a, constructed and operating in substantially the manner and for the purposes hereinbefore set forth.

2. The combination, for the purposes of forming a complete sand mold and core, of a set of planesurfaced follow-boards, a pair of flasks, each one of which is formed or provided with inwardly-projecting devices, 0, and suitable rolling-boards or bottom boards, the whole adapted to operate in the manner hereinbefore described.

In witness whereof I have hereunto set my hand this 28th day of October, 1886.

, JUSTIN PARMELEE. In presence of- JNo. CLIFFORD, W. S. VERITY, Jr. 

